Ultum Nature Systems Controbase Nutrient-Rich Base Substrate for Planted Aquariums Ultum Nature Systems Controbase is a highly porous, nutrient-rich base substrate designed to support heavy root-feeding aquatic plants. Made from pumice stone infused with slow-releasing nutrients like Nitrogen, Potassium, Phosphorus, and trace elements, Controbase helps regulate excess nutrients, improve plant vitality, and cultivate beneficial bacteria. Its larger 6-8mm granule size enhances water flow and oxygenation, ensuring a healthy and balanced aquarium environment. Key Features & Benefits ✅ Pre-Bagged in Mesh Filter Bags – Comes ready to use for easy placement and removal. Simply place the mesh bags in your aquarium without opening.✅ Nutrient-Rich Formula – Infused with slow-releasing essential nutrients, lasting approximately three months before requiring replacement.✅ Improves Water Circulation & Beneficial Bacteria Growth – The highly porous structure promotes better oxygenation and a stronger biological filtration system.✅ Customizable for Aquascaping – Controbase can be stacked to create slope variations for an enhanced aquascape design.✅ Ideal Pairing with Controsoil or Controsand – Designed to be layered underneath your preferred aquarium substrate for optimal plant growth and nutrient absorption. How to Use Do Not Wash – Use as is, straight from the bag. Spread Evenly – Place the mesh bags at the bottom of the aquarium before adding the top substrate. Layer at Least 2 Inches of Substrate – Ensure a minimum of 2 inches of Controsoil, Controsand, or gravel is placed on top. Product Specifications 🔹 UNS Controbase 2L✔ Includes 4 individual 0.5L mesh bags✔ Suitable for aquariums up to 20 gallons (e.g., UNS 60U Standard Rimless Tank) 🔹 UNS Controbase 8L✔ Includes 16 individual 0.5L mesh bags✔ Suitable for aquariums up to 114 gallons (e.g., UNS 120U Standard Rimless Tank) What’s Included ✅ 1x Bag of UNS Controbase (2L or 8L)